package com.lyd.blog.web.admin;

import com.lyd.blog.po.Tag;
import com.lyd.blog.service.TagService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.web.PageableDefault;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.validation.Valid;

@Controller
@RequestMapping("/admin")
public class TagController {

    @Autowired
    private TagService tagService;

    @GetMapping("/tags")    //PageableDefault 设置分页默认的值.大小，排序方式
    private String tags(@PageableDefault(size = 5,sort = {"id"},direction = Sort.Direction.DESC)
                                     Pageable pageable, Model model){
        model.addAttribute("page",tagService.listTag(pageable));
        return "admin/tags";
    }

    //返回新增页面
    @GetMapping("/tags/input")
    public String input(Model model){
        model.addAttribute("tag",new Tag());
        return "admin/tags-input";
    }

    @GetMapping("/tags/{id}/input")
    public String editInput(@PathVariable Long id, Model model){
            model.addAttribute("tag",tagService.getTag(id));
            return "admin/tags-input";
    }

    //提交新增标签
    @PostMapping("/tags")
    public String post(@Valid Tag tag, BindingResult result, RedirectAttributes attributes){
        Tag tag1=tagService.getTagByName(tag.getName());
        if (tag1 != null){              //校验重复标签
            result.rejectValue("name","nameError","不能添加重复标签");
        }
        if (result.hasErrors()){
            return "admin/tags-input";
        }

        Tag t=tagService.saveTag(tag);
        if (t==null){                  //校验添加标签名称为空
            attributes.addFlashAttribute("message","新增标签失败");
        }else {
            attributes.addFlashAttribute("message","新增标签成功");
        }
        return "redirect:/admin/tags";
    }

    //修改标签
    @PostMapping("/tags/{id}")
    public String editPost(@Valid Tag tag, BindingResult result,
                           @PathVariable Long id, RedirectAttributes attributes){
        Tag tag1=tagService.getTagByName(tag.getName());
        if (tag1 != null){              //校验重复标签
            result.rejectValue("name","nameError","不能添加重复标签");
        }
        if (result.hasErrors()){
            return "admin/tags-input";
        }

        Tag t=tagService.updateTag(id,tag);
        if (t==null){                  //校验添加标签名称为空
            attributes.addFlashAttribute("message","修改标签失败");
        }else {
            attributes.addFlashAttribute("message","修改标签成功");
        }
        return "redirect:/admin/tags";
    }

    //删除标签
    @GetMapping("/tags/{id}/delete")
    public String delete(@PathVariable Long id,RedirectAttributes attributes){
        tagService.deleteTag(id);
        attributes.addFlashAttribute("message","删除标签成功");
        return "redirect:/admin/tags";

    }
}
